Patents by Inventor Yuki Ichikawa

Yuki Ichikawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8836941
    Abstract: An device for Raman spectroscopy such as surface enhanced Raman spectroscopy (SERS) is disclosed herein. Various embodiments may be utilized to prepare a SERS substrate using several deposition techniques such as pulsed laser deposition. Some embodiments optimize coverage, volume, or elements of SERS active metals. The method is a single step inexpensive method for preparing a SERS active substrate. In some embodiments a coating layer underneath the SERS active metals is utilized for additional enhancements.
    Type: Grant
    Filed: November 22, 2010
    Date of Patent: September 16, 2014
    Assignee: IMRA America, Inc.
    Inventors: Makoto Murakami, Yong Che, Bing Liu, Yuki Ichikawa
  • Publication number: 20140213807
    Abstract: The present disclosure is directed to methods of preparing stable suspensions of precious metal nanoparticles and methods for attaching bio-molecules to the nanoparticles. The formation of nanoparticles can be accomplished by either chemical synthesis or pulsed laser ablation in a liquid. The present disclosure reveals the importance of controlling the conductivity of the dispersion medium during pulsed laser ablation in a liquid to control the particle size of the nanoparticles. The present disclosure also reveals the importance of adjusting and maintaining the conductivity in a range of 25 ?S/cm or less during storage of the nanoparticles and just prior to performing bioconjugation reactions. The control of conductivity is an important process for maintaining the nanoparticles as a stable non-aggregated colloidal suspension in a dispersion medium.
    Type: Application
    Filed: January 23, 2014
    Publication date: July 31, 2014
    Inventors: Yuki Ichikawa, Andrius Marcinkevicus, Masayuki Ito, Wei Qian
  • Publication number: 20140170070
    Abstract: In the present invention, a method of producing stable bare colloidal gold nanoparticles is disclosed. The nanoparticles can subsequently be subjected to partial or full surface modification. The method comprises preparation of colloidal gold nanoparticles in a liquid by employing a top-down nanofabrication method using bulk gold as a source material. The surface modification of these nanoparticles is carried out by adding one or multiple types of ligands each containing functional groups which exhibit affinity for gold nanoparticle surfaces to produce the conjugates. Because of the high efficiency and excellent stability of the nanoparticles produced by this method, the fabricated gold nanoparticle conjugates can have surface coverage with functional ligands which can be tuned to be any percent value between 0 and 100%.
    Type: Application
    Filed: February 24, 2014
    Publication date: June 19, 2014
    Inventors: Wei Qian, Makoto Murakami, Yuki Ichikawa, Yong Che
  • Publication number: 20140106122
    Abstract: The present invention provides an optical layered body which stably keeps light resistance such as ultraviolet resistance and oxidation resistance while keeping conventional physical properties and optical properties as the outermost surface material of an image display device, which is excellent in an antistatic property and which is capable of providing high image contrast when employed for an image display device. The optical layered body has a light transmitting substrate and a resin layer formed on one surface of the light transmitting substrate and is characterized in that the resin layer contains a binder resin, a polythiophene, an auxiliary conductive agent, and a leveling agent.
    Type: Application
    Filed: May 12, 2011
    Publication date: April 17, 2014
    Applicant: Dai Nippon Printing Co., Ltd
    Inventors: Junya Eguchi, Tasuku Kitamura, Yuki Ichikawa, Takashi Kodama
  • Patent number: 8697129
    Abstract: In the present invention, a method of producing stable bare colloidal gold nanoparticles is disclosed. The nanoparticles can subsequently be subjected to partial or full surface modification. The method comprises preparation of colloidal gold nanoparticles in a liquid by employing a top-down nanofabrication method using bulk gold as a source material. The surface modification of these nanoparticles is carried out by adding one or multiple types of ligands each containing functional groups which exhibit affinity for gold nanoparticle surfaces to produce the conjugates. Because of the high efficiency and excellent stability of the nanoparticles produced by this method, the fabricated gold nanoparticle conjugates can have surface coverage with functional ligands which can be tuned to be any percent value between 0 and 100%.
    Type: Grant
    Filed: March 2, 2011
    Date of Patent: April 15, 2014
    Assignee: IMRA America, Inc.
    Inventors: Wei Qian, Makoto Murakami, Yuki Ichikawa, Yong Che
  • Publication number: 20130327987
    Abstract: A method of forming nanometer sized fine particles of functional ceramic from a bulk functional ceramic, particularly fine particles of phosphorous ceramics from a bulk phosphor material is disclosed. The method relies on irradiation of a bulk phosphorous ceramic in a liquid with an ultrashort-pulsed-laser-fragmentation beam to thereby form nanometer sized particles of the phosphorous ceramic. The method is unique in that the generated particles retain the chemical and crystalline properties of the bulk phosphorous ceramic. The generated solutions are stable colloids from which the particles can be isolated or used as is.
    Type: Application
    Filed: August 16, 2013
    Publication date: December 12, 2013
    Applicant: IMRA America, Inc.
    Inventors: Yuki Ichikawa, Zhendong HU, Bing LU, Yong Che
  • Patent number: 8540173
    Abstract: A method of forming nanometer sized fine particles of functional ceramic from a bulk functional ceramic, particularly fine particles of phosphorous ceramics from a bulk phosphor material is disclosed. The method relies on irradiation of a bulk phosphorous ceramic in a liquid with an ultrashort-pulsed-laser-fragmentation beam to thereby form nanometer sized particles of the phosphorous ceramic. The method is unique in that the generated particles retain the chemical and crystalline properties of the bulk phosphorous ceramic. The generated solutions are stable colloids from which the particles can be isolated or used as is.
    Type: Grant
    Filed: November 22, 2010
    Date of Patent: September 24, 2013
    Assignee: IMRA America, Inc.
    Inventors: Yuki Ichikawa, Zhengong Hu, Bing Liu, Yong Che
  • Publication number: 20130209523
    Abstract: The present disclosure is directed to an in-liquid laser-based method for fabricating a solution of fine particles of amorphous solid medicinal compounds, a solution of fine particles of amorphous medicinal agents made with the method, and fine particles made with the method. By using a target solidified via a phase transition process to covert an initial crystalline structure into an amorphous solid, technical difficulties with handling a hydraulically-pressed target are overcome. The laser-based ablation process produces amorphous solid medicinal compound fine particles, which improves the bioavailability and solubility of the medicinal compound. The improvement results from a combination of: disordered crystalline structure and enlarged relative surface area by particle size reduction. The laser based method may be carried out with ultrashort pulsed laser systems, or with UV nanosecond lasers.
    Type: Application
    Filed: February 13, 2013
    Publication date: August 15, 2013
    Inventors: Yuki Ichikawa, Andrius Marcinkevicus
  • Patent number: 8450689
    Abstract: A non-contacting type paint film thickness measuring device includes a generating portion for generating a terahertz pulse light, a detecting portion for detecting the terahertz pulse light, a measured wave form in time-series obtaining portion for obtaining a measured wave form indicating an electric field intensity of a terahertz echo pulse light, and an intrinsic wave form in time-series obtaining portion, having an intrinsic electric field spectrum calculating portion and an intrinsic wave form in time-series calculating portion, for calculating an intrinsic wave form in time-series of an object.
    Type: Grant
    Filed: December 10, 2009
    Date of Patent: May 28, 2013
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Hideyuki Ohtake, Yuki Ichikawa
  • Publication number: 20120225021
    Abstract: In the present invention, a method of producing stable bare colloidal gold nanoparticles is disclosed. The nanoparticles can subsequently be subjected to partial or full surface modification. The method comprises preparation of colloidal gold nanoparticles in a liquid by employing a top-down nanofabrication method using bulk gold as a source material. The surface modification of these nanoparticles is carried out by adding one or multiple types of ligands each containing functional groups which exhibit affinity for gold nanoparticle surfaces to produce the conjugates. Because of the high efficiency and excellent stability of the nanoparticles produced by this method, the fabricated gold nanoparticle conjugates can have surface coverage with functional ligands which can be tuned to be any percent value between 0 and 100%.
    Type: Application
    Filed: March 2, 2011
    Publication date: September 6, 2012
    Inventors: Wei QIAN, Makoto MURAKAMI, Yuki ICHIKAWA, Yong CHE
  • Publication number: 20110193025
    Abstract: A method of forming nanometer sized fine particles of functional ceramic from a bulk functional ceramic, particularly fine particles of phosphorous ceramics from a bulk phosphor material is disclosed. The method relies on irradiation of a bulk phosphorous ceramic in a liquid with an ultrashort-pulsed-laser-fragmentation beam to thereby form nanometer sized particles of the phosphorous ceramic. The method is unique in that the generated particles retain the chemical and crystalline properties of the bulk phosphorous ceramic. The generated solutions are stable colloids from which the particles can be isolated or used as is.
    Type: Application
    Filed: November 22, 2010
    Publication date: August 11, 2011
    Inventors: Yuki ICHIKAWA, Zhengong Hu, Bing Liu, Yong Che
  • Publication number: 20110194106
    Abstract: An device for Raman spectroscopy such as surface enhanced Raman spectroscopy (SERS) is disclosed herein. Various embodiments may be utilized to prepare a SERS substrate using several deposition techniques such as pulsed laser deposition. Some embodiments optimize coverage, volume, or elements of SERS active metals. The method is a single step inexpensive method for preparing a SERS active substrate. In some embodiments a coating layer underneath the SERS active metals is utilized for additional enhancements.
    Type: Application
    Filed: November 22, 2010
    Publication date: August 11, 2011
    Inventors: Makoto MURAKAMI, Yong Che, Bing Liu, Yuki Ichikawa
  • Publication number: 20100149520
    Abstract: A non-contacting type paint film thickness measuring device includes a generating portion for generating a terahertz pulse light, a detecting portion for detecting the terahertz pulse light, a measured wave form in time-series obtaining portion for obtaining a measured wave form indicating an electric field intensity of a terahertz echo pulse light, and an intrinsic wave form in time-series obtaining portion, having an intrinsic electric field spectrum calculating portion and an intrinsic wave form in time-series calculating portion, for calculating an intrinsic wave form in time-series of an object.
    Type: Application
    Filed: December 10, 2009
    Publication date: June 17, 2010
    Applicant: AISIN SEIKI KABUSHIKI KAISHA
    Inventors: Hideyuki OHTAKE, Yuki ICHIKAWA
  • Publication number: 20100054296
    Abstract: A terahertz wave generating apparatus includes an excitation light source for outputting an excitation light at a predetermined wavelength, an optical crystal being excited by an irradiation with the excitation light in order to generate a terahertz wave and terahertz wave amplifying means for repeatedly performing an optical parametric amplification for the terahertz wave by use of the excitation light, wherein the terahertz wave amplifying means includes an optical waveguide having the optical crystal serving as a core and a medium serving as a clad whose refractive index is smaller than a refractive index of the optical crystal, and the inputted excitation light is propagated within the optical waveguide with fulfilling a condition for a total reflection.
    Type: Application
    Filed: August 24, 2009
    Publication date: March 4, 2010
    Applicant: AISIN SEIKI KABUSHIKI KAISHA
    Inventors: Hideyuki OHTAKE, Yuki Ichikawa, Yuzuru Uehara, Koichiro Tanaka, Masaya Nagai